The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform
Xiaoping Yang - One of the best experts on this subject based on the ideXlab platform.
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Influence of a liquid-like MWCNT reinforcement on interfacial and mechanical properties of Carbon Fiber Filament winding composites
Polymer, 2016Co-Authors: Qingjie Zhang, Gang Sui, Liang Gao, Tian Liu, Wei-hong Zhong, Xiaoping YangAbstract:Abstract A kind of liquid-like multiwalled Carbon nanotube (MWCNT) reinforcements was prepared and dispersed into epoxy matrix. The effects of the liquid-like MWCNT reinforcements on the processing, mechanical and interfacial properties of Carbon Fiber Filament wound composites were investigated. The results showed that the liquid-like MWCNT reinforcements can be uniformly dispersed in epoxy matrix which showed the good processing properties for winding technology. The liquid-like MWCNT reinforcements could participate in the cross-linking reaction with epoxy groups, improve the interfacial bonding between Carbon Fibers and resin matrix, and change the failure mode of the resulting composites. Compared to the neat epoxy system, the significant enhancement in tensile and compressive properties of resin matrix was realized by adding 3 wt% liquid-like MWCNT reinforcements. Meanwhile an increase of 8 °C in glass transition temperature, 8% in interlaminar shear strength and 17% in tensile strength of MT300 Carbon Fiber Naval Ordnance Laboratory rings was achieved.
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Influence of matrix modulus on the mechanical and interfacial properties of Carbon Fiber Filament wound composites
RSC Advances, 2015Co-Authors: Qingjie Zhang, Shengbiao Liang, Gang Sui, Xiaoping YangAbstract:The effect of epoxy resin matrix modulus on the mechanical and interfacial properties of T700 Carbon Fiber and T800 Carbon Fiber Filament wound composites was investigated. Different aromatic amine curing agents were selected to change the modulus of the same kind of resin matrix. The mechanical properties of Carbon Fiber Filament wound composites were characterized through Naval Ordinance Laboratory-ring (NOL) burst tests, and interlaminar shear strength (ILSS) tests. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and dynamic mechanical thermal analysis (DMA) were used to characterize the failure surfaces and interfacial properties of the resulting composites. The results showed that, even if Carbon Fibers were fully impregnated with epoxy resin, the mechanical properties of composites and the mode of interfacial failure were closely related to the modulus of the resin matrix. The resin matrix with a high modulus was found to be an essential prerequisite to excellent mechanical and interfacial properties of the resulting composites.
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Curing Kinetics Study of an Epoxy Resin System for T800 Carbon Fiber Filament Wound Composites by Dynamic and Isothermal DSC
Journal of Applied Polymer Science, 2008Co-Authors: Weiming Chen, Xiaoping YangAbstract:Curing kinetics of DGEAC/DDM/DETDA/DGEB epoxy resin system was studied using dynamic and isothermal differential scanning calorimetry (DSC) for the preparation of T800 Carbon Fiber Filament wound composites. In dynamic experiment, four kinds of epoxy resin systems were studied. Curing characteristics, such as curing range and curing temperatures of the epoxy resin system with mixed hardeners (DGEAC/DDM/DETDA), were found lying within those of the two epoxy resin systems with a single hardener (DGEAC/DDM, DGEAC/DETDA). The addition of reactive diluter (DGEB) caused increase in curing range and exothermic heat. In addition, the activation energies calculated by the isoconversional method of all four resin systems decreased to the minimum value in the early stage due to the autocatalytic role of hydroxyl groups in the curing reaction and then increased due to the increased viscosity and crosslink of epoxy systems. The addition of reactive diluter led to the decrease in activation energies on the initial stage (conversion = 0.1–0.3). In isothermal experiment, a series of isothermal DSC runs provided information about the curing kinetics of the DGEAC/DDM/DETDA/DGEB system over a wide temperature range. The results showed that the isothermal kinetic reaction of the epoxy resin followed an autocatalytic kinetic mechanism. The autocatalytic kinetic expression chosen in this work was suitable to analyze the curing kinetics of this system. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Qingjie Zhang - One of the best experts on this subject based on the ideXlab platform.
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Influence of a liquid-like MWCNT reinforcement on interfacial and mechanical properties of Carbon Fiber Filament winding composites
Polymer, 2016Co-Authors: Qingjie Zhang, Gang Sui, Liang Gao, Tian Liu, Wei-hong Zhong, Xiaoping YangAbstract:Abstract A kind of liquid-like multiwalled Carbon nanotube (MWCNT) reinforcements was prepared and dispersed into epoxy matrix. The effects of the liquid-like MWCNT reinforcements on the processing, mechanical and interfacial properties of Carbon Fiber Filament wound composites were investigated. The results showed that the liquid-like MWCNT reinforcements can be uniformly dispersed in epoxy matrix which showed the good processing properties for winding technology. The liquid-like MWCNT reinforcements could participate in the cross-linking reaction with epoxy groups, improve the interfacial bonding between Carbon Fibers and resin matrix, and change the failure mode of the resulting composites. Compared to the neat epoxy system, the significant enhancement in tensile and compressive properties of resin matrix was realized by adding 3 wt% liquid-like MWCNT reinforcements. Meanwhile an increase of 8 °C in glass transition temperature, 8% in interlaminar shear strength and 17% in tensile strength of MT300 Carbon Fiber Naval Ordnance Laboratory rings was achieved.
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Influence of matrix modulus on the mechanical and interfacial properties of Carbon Fiber Filament wound composites
RSC Advances, 2015Co-Authors: Qingjie Zhang, Shengbiao Liang, Gang Sui, Xiaoping YangAbstract:The effect of epoxy resin matrix modulus on the mechanical and interfacial properties of T700 Carbon Fiber and T800 Carbon Fiber Filament wound composites was investigated. Different aromatic amine curing agents were selected to change the modulus of the same kind of resin matrix. The mechanical properties of Carbon Fiber Filament wound composites were characterized through Naval Ordinance Laboratory-ring (NOL) burst tests, and interlaminar shear strength (ILSS) tests. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and dynamic mechanical thermal analysis (DMA) were used to characterize the failure surfaces and interfacial properties of the resulting composites. The results showed that, even if Carbon Fibers were fully impregnated with epoxy resin, the mechanical properties of composites and the mode of interfacial failure were closely related to the modulus of the resin matrix. The resin matrix with a high modulus was found to be an essential prerequisite to excellent mechanical and interfacial properties of the resulting composites.
Isamu Uchida - One of the best experts on this subject based on the ideXlab platform.
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Determination of chemical diffusion coefficients in metal hydride particles with a microelectrode technique
Journal of The Electrochemical Society, 1997Co-Authors: Tatsuo Nishina, Hironori Ura, Isamu UchidaAbstract:Microelectrochemical studies for hydrogen storage materials have been carried out by using a microelectrode technique. A Carbon Fiber Filament was contacted with single particles of LaNi{sub 4.5}Al{sub 0.5}, LmNi{sub 4.0}Cr{sub 0.4}Mn{sub 0.3}Al{sub 0.3}, ZrNi{sub 1.4}, ZrMn{sub 0.6}Co{sub 0.1}V{sub 0.2}Ni{sub 1.2}, and ZrMn{sub 0.4}Cr{sub 0.4}Ni{sub 1.2} in 1 M KOH solutions by using a micromanipulator, where Lm indicates the lanthanum-rich rare-earth metal. In this way, cyclic voltammetry and potential step experiments, together with the in situ x-ray diffraction experiments, were conducted and the apparent hydrogen diffusion coefficients in solid phases were determined. The current responses recorded as a function of time were analyzed with a spherical diffusion model and the results are reported herein.
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Electrochemical measurements of single particles of Pd and LaNi5 with a microelectrode technique
Journal of Electroanalytical Chemistry, 1995Co-Authors: Hironori Ura, Tatsuo Nishina, Isamu UchidaAbstract:Abstract Microelectrochemical studies of hydrogen storage materials have been carried out using a microelectrode technique. A micromanipulator was used to contact single particles of Pd and LaNi 5 in alkaline solutions with a Carbon Fiber Filament. In this way cyclic voltammetry and potential step experiments were conducted and the apparent hydrogen diffusion coefficients in solid phases were determined. The current responses recorded as a function of time were analyzed with a spherical diffusion model: the diffusion coefficients were D = (4.3 ± 1.9) × 10 −8 cm 2 s −1 for a LaNi 5 alloy particle and D = (2.8 ± 0.2) × 10 −7 cm 2 s −1 for a Pd particle, which were in good agreement with values reported in literature.
Gang Sui - One of the best experts on this subject based on the ideXlab platform.
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Influence of a liquid-like MWCNT reinforcement on interfacial and mechanical properties of Carbon Fiber Filament winding composites
Polymer, 2016Co-Authors: Qingjie Zhang, Gang Sui, Liang Gao, Tian Liu, Wei-hong Zhong, Xiaoping YangAbstract:Abstract A kind of liquid-like multiwalled Carbon nanotube (MWCNT) reinforcements was prepared and dispersed into epoxy matrix. The effects of the liquid-like MWCNT reinforcements on the processing, mechanical and interfacial properties of Carbon Fiber Filament wound composites were investigated. The results showed that the liquid-like MWCNT reinforcements can be uniformly dispersed in epoxy matrix which showed the good processing properties for winding technology. The liquid-like MWCNT reinforcements could participate in the cross-linking reaction with epoxy groups, improve the interfacial bonding between Carbon Fibers and resin matrix, and change the failure mode of the resulting composites. Compared to the neat epoxy system, the significant enhancement in tensile and compressive properties of resin matrix was realized by adding 3 wt% liquid-like MWCNT reinforcements. Meanwhile an increase of 8 °C in glass transition temperature, 8% in interlaminar shear strength and 17% in tensile strength of MT300 Carbon Fiber Naval Ordnance Laboratory rings was achieved.
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Influence of matrix modulus on the mechanical and interfacial properties of Carbon Fiber Filament wound composites
RSC Advances, 2015Co-Authors: Qingjie Zhang, Shengbiao Liang, Gang Sui, Xiaoping YangAbstract:The effect of epoxy resin matrix modulus on the mechanical and interfacial properties of T700 Carbon Fiber and T800 Carbon Fiber Filament wound composites was investigated. Different aromatic amine curing agents were selected to change the modulus of the same kind of resin matrix. The mechanical properties of Carbon Fiber Filament wound composites were characterized through Naval Ordinance Laboratory-ring (NOL) burst tests, and interlaminar shear strength (ILSS) tests. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and dynamic mechanical thermal analysis (DMA) were used to characterize the failure surfaces and interfacial properties of the resulting composites. The results showed that, even if Carbon Fibers were fully impregnated with epoxy resin, the mechanical properties of composites and the mode of interfacial failure were closely related to the modulus of the resin matrix. The resin matrix with a high modulus was found to be an essential prerequisite to excellent mechanical and interfacial properties of the resulting composites.
Hong-ki Lee - One of the best experts on this subject based on the ideXlab platform.
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effect of Carbon Fiber Filament and graphite Fiber on the mechanical properties and electrical conductivity of elastic Carbon composite bipolar plate for pemfc
Transactions of the Korean hydrogen and new energy society, 2014Co-Authors: Jae-young Lee, Woo Kum Lee, Hyungryul Rim, Gyubum Joung, Hong-ki LeeAbstract:Highly conductive bipolar plate for polymer electrolyte membrane fuel cell (PEMFC) was prepared using phenol novolac-type epoxy/graphite powder (GP)/Carbon Fiber Filament (CFF) composite, and a rubber-modified epoxy resin was introduced in order to give elasticity to the bipolar plate graphite Fiber (GF) was incorporated in order to improve electrical conductivity. To find out the cure condition of the mixture of novolac-type and rubber-modified epoxies, differential scanning calorimetry (DSC) was carried out and their data were introduced to Kissinger equation. And tensile and flexural tests were carried out using universal testing machine (UTM) and the surface morphology of the fractured specimen and the interfacial bonding between epoxy matrix and CFF or GF were observed by a scanning electron microscopy (SEM).
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Preparation of Elastic Bipolar Plate for Polymer Electrolyte Fuel Cells
Volume 15: Safety Reliability and Risk; Virtual Podium (Posters), 2013Co-Authors: Jae-young Lee, Bum Choul Choi, Woo Kum Lee, Joong Pyo Shim, Hong-ki LeeAbstract:Highly conductive bipolar plate for polymer electrolyte membrane fuel cell (PEMFC) was prepared using phenol novolac-type epoxy/graphite powder (GP)/Carbon Fiber Filament (CFF) composite, and a rubber-modified epoxy resin was introduced to the phenol novolac-type epoxy resin in order to give elasticity to the bipolar plate. The cure condition of the neat epoxy system, differential scanning calorimetry (DSC) was carried out and the DSC data were introduced to Kissinger equation. And tensile and flexural tests were carried out using universal testing machine (UTM) and the surface morphology of the fractured specimen and the interfacial bonding between epoxy matrix and CFF were observed by a scanning electron microscopy (SEM). Kissinger expression showed that the activation energy for the cure kinetics of novolac epoxy (9.3g)/rubber epoxy (1.0g)/curing agent (9.6g)/accelerator (0.1g) system was 76.8 kJ/mol and the pre-exponential factor was 1.73 × 1010 min−1. As was expected, electrical conductivity increased with increasing total Carbon content, and the value increased with increasing CFF content at the same Carbon content. Tensile strength and flexural strength linearly decreased with increasing epoxy content, however at the same Carbon content, these values increased with increasing CFF content. It was because the CFF acted as electrical conductive pass and the good effect on the mechanical properties was due to the strong bonding between CFF and epoxy resin, which was confirmed by the SEM.Copyright © 2013 by ASME
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effect of Carbon Fiber Filament on electrical and mechanical properties of epoxy graphite composite
Advanced Materials Research, 2013Co-Authors: Jae-young Lee, Bum Choul Choi, Woo Kum Lee, Il Yub Choi, Joong Pyo Shim, Hong-ki LeeAbstract:Epoxy/graphite powder (GP)/Carbon Fiber Filament (CFF) composites have been prepared in various weight ratios and electrical and mechanical properties were estimated in order to use for the bipolar plate in PEMFC. As was expected, electrical conductivity increased with increasing total Carbon content, and the value increased with increasing CFF content in the same Carbon content. Tensile strength and flexural strength linearly decreased with increasing epoxy content, however in the same Carbon content, these values increased with increasing CFF content. The good effect of CFF on the electrical and mechanical properties was due to the strong bonding between CFF and epoxy resin, which was confirmed by scanning electron microscopy (SEM).
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Effect of Carbon Fiber Filament on Electrical and Mechanical Properties of Epoxy/Graphite Composite
Advanced Materials Research, 2013Co-Authors: Jae-young Lee, Bum Choul Choi, Woo Kum Lee, Il Yub Choi, Joong Pyo Shim, Hong-ki LeeAbstract:Epoxy/graphite powder (GP)/Carbon Fiber Filament (CFF) composites have been prepared in various weight ratios and electrical and mechanical properties were estimated in order to use for the bipolar plate in PEMFC. As was expected, electrical conductivity increased with increasing total Carbon content, and the value increased with increasing CFF content in the same Carbon content. Tensile strength and flexural strength linearly decreased with increasing epoxy content, however in the same Carbon content, these values increased with increasing CFF content. The good effect of CFF on the electrical and mechanical properties was due to the strong bonding between CFF and epoxy resin, which was confirmed by scanning electron microscopy (SEM).